You receive: This product includes a resonance generator, an acrylic case with a small magnet, and a USB data cable. Note: The acrylic case may have a slight odor, which can dissipate when placed in the sun or in a well-ventilated area for 2 to 3 days. It is recommended to remove the protective film before use. This device produces low-frequency electromagnetic waves and requires the use of headphones. Adjustable frequency: 0.01 to 100,000 Hz adjustable frequency range. Our sine wave generator allows you to set the frequency according to your needs for improved efficiency and personalization. The default frequency is 7.83 Hz, and it can also be adjusted to other frequencies such as 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveforms: Our audio generator offers multiple waveform options, including sine wave, square wave, and reverse square wave, making it suitable for various applications in environments such as laboratories and studios. Promote relaxation: The adjustable resonance generator emits sine waves that help create a relaxing environment, potentially improving mental state. It makes a thoughtful gift for friends and family on birthdays, Christmas, and other holidays. Portable size: The sound generator measures approximately 5.9 x 5.5 x 1.2 inches, and the acrylic case measures approximately 6.2 x 5.8 x 1.5 inches, providing good protection for the device. Its compact size and USB-powered design make it easy to carry and use at home, work, or while traveling. Stable and reliable: The sine wave generator has a default frequency of 7.83 Hz. The sine wave voltage amplitude is 3V, and the square wave voltage amplitude is 5V, ensuring stable and accurate signal output. Wide application: This adjustable frequency generator is ideal for various settings that require signal generation and frequency adjustment, such as electronic equipment testing, device calibration, and scientific experiments. Frequency range: 0.01 to 3000 Hz.